How to write simple fireworks code in C language

To write a simple C language fireworks code, you need to follow the following steps: Include header files and libraries. Define constants and macros. Create a particle data structure. Declare global variables. Initialize the fireworks particles in the main() function. Update the particle's position and velocity in the game loop and draw them. Check for and destroy particles that have reached their end of life.

Simple Fireworks Code in C

To write a simple fireworks code in C, you can use the following steps ：

1. Header files and libraries

<code class="c">#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h></code>

2. Constants and macro definitions

Define some for controlling the appearance of fireworks and behavior constants and macros:

<code class="c">#define NUM_PARTICLES    100
#define MAX_SPEED        10
#define MAX_LIFETIME     200
#define GRAVITY          0.1</code>

3. Data structure

Create a structure to store the data of a single firework particle:

<code class="c">typedef struct {
    double x, y;          // 粒子的位置
    double vx, vy;        // 粒子的速度
    double lifetime;      // 粒子的剩余寿命
    int color;            // 粒子的颜色
} Particle;</code>

4. Global variables

Declare an array to store fireworks particles:

<code class="c">Particle particles[NUM_PARTICLES];</code>

5. Initialization

inmain() function, use the srand() function to seed the random number generator, and then randomly initialize the fireworks particles:

<code class="c">int main() {
    srand(time(NULL));

    for (int i = 0; i < NUM_PARTICLES; i++) {
        particles[i].x = rand() % 800;
        particles[i].y = 600;
        particles[i].vx = (rand() % 2000 - 1000) / 100.0;
        particles[i].vy = (rand() % 2000 - 1000) / 100.0;
        particles[i].lifetime = MAX_LIFETIME;
        particles[i].color = rand() % 6;
    }

    // ...
}</code>

6. Update and draw

In the game loop, update the position and velocity of each firework particle and draw them:

<code class="c">void update() {
    for (int i = 0; i < NUM_PARTICLES; i++) {
        particles[i].x += particles[i].vx;
        particles[i].y += particles[i].vy;

        particles[i].vy += GRAVITY;

        particles[i].lifetime--;

        // 绘制粒子
        // ...
    }
}</code>

#7. Check for destruction

In each update loop , check whether the life of each firework particle has expired, and if so, destroy it from the array:

<code class="c">void check_destroy() {
    for (int i = 0; i < NUM_PARTICLES; i++) {
        if (particles[i].lifetime <= 0) {
            particles[i] = particles[NUM_PARTICLES - 1];
            NUM_PARTICLES--;
        }
    }
}</code>

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